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US2523279A - Multiplex high-frequency electrical pulse signaling system - Google Patents

Multiplex high-frequency electrical pulse signaling system Download PDF

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Publication number
US2523279A
US2523279A US618332A US61833245A US2523279A US 2523279 A US2523279 A US 2523279A US 618332 A US618332 A US 618332A US 61833245 A US61833245 A US 61833245A US 2523279 A US2523279 A US 2523279A
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US
United States
Prior art keywords
pulses
pulse
channel
duration
signaling system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US618332A
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English (en)
Inventor
Chatterjea Prafulla Kumar
Houghton Leslie Wilfred
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE472934D priority Critical patent/BE472934A/xx
Priority to FR962120D priority patent/FR962120A/fr
Priority to GB18640/44A priority patent/GB582198A/en
Priority claimed from GB558743A external-priority patent/GB582177A/en
Priority to GB18641/44A priority patent/GB582199A/en
Priority to US526566A priority patent/US2447233A/en
Priority claimed from US526566A external-priority patent/US2447233A/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to US618332A priority patent/US2523279A/en
Priority to US620818A priority patent/US2454773A/en
Publication of US2523279A publication Critical patent/US2523279A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/042—Distributors with electron or gas discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/045—Distributors with CRT

Definitions

  • the present invention relates to multiplex signal high frequency transmissions systems of the kind utilising electrical pulses.
  • This application is a division of our co-pending application Serial No. 526,566, filed March 14, 1944, now U. S. Patent No. 2,447,233, issued August 17, 1948.
  • signal waves bearing intelligence can be transmitted by means of a train of electrical pulses occurring at equal time intervals and whose durations are varied in accordance with the instantaneous amplitude of the signal.
  • Such pulses are herein referred to as duration modulated pulses.
  • short electrical pulses of constant duration are transmitted to mark the leading and trailing edges of duration modulation pulses, and when either the leading or trailing edges occur at equal intervals of time, only the pulses marking the edges of the duration modulated pulses which occur at varying intervals of time need be transmitted.
  • This type of transmission is sometimes referred to as a single pulse or time phase modulated pulse transmission or pulsed phase modulation, the pulses of constant short duration occurring at varying intervals of time in accordance with the instan taneous amplitude of the signal wave to be transmitted.
  • the system When both the fixed and moving marking pulses of a duration modulated system are transmitted, the system is referred to as a double pulse system.
  • the fixed pulse In the single pulse system, the fixed pulse may be re-inserted at the receiver and the solid pulses or duration modulated pulses obtained from the fixed and movable pairs of pulses for example by means of known build back circuits.
  • the pulse duration is only a small fraction of the time interval between the occurrence of successive pulses, and if the variation of this time interval taken up for a maximum time or phase modulation of the pulses is also small, then other trains of similar pulses may be transmitted having the same pulse repetition frequency, but whose pulses occur in the intervals between the pulses of another train.
  • each pulse train may'bear time or phase modulation of its respective signal wave and a multiplex channel transmission system is pro-- vided. It is the object of this invention to provide practical arrangements whereby such a system may be put into practice.
  • the pulses may be transmitted by line, wave guide or radio, and may comprise direct current pulses or trains of waves of higher frequency than the pulse repetition frequency.
  • the arrangements for producing in each channel a train of pulses time phased in accordance with the signal wave to be transmitted by said channel comprise an oscillation generator, a plurality of pulse forming circuit arrangements including amplifiers associated with respective channels, means for applying the outputs from.
  • said generator to each of said pulse forming circuit.arrangements so arranged as to pass progressively larger portions of the waveform from channel to channel, thus producing in the respective outputs pulses whose durations vary from channel to channel, means for modulating the ddrations of said pulses in accordance with the modulating waves of the respective channels, means for differentiating the duration modulated pulses and means for eliminating one of the differential series of pulses so obtained to isolate a timephased series of pulses in each channel.
  • Figure 1 shows in block schematic of a circuit arrangement embodying the invention
  • FIG. 1 is an explanatory diagram used in connection with Figure 1.
  • the reference numeral l8 represents a sawtooth generator or generator of any waveform from which it is possible to produce a variable width pulse. This is then fed into pulse former units I, 2, 3 and 4 respectively each containing an amplifier, and these amplifiers are each biassed or otherwise adjusted so as to pass varying portions of'the wave form and thus to produce progressively longer duration pulses from channnel to channel (see Figure 2).
  • these various width pulses may be duration modulated and then after differentiation by units 9, l0, II and I2 which comprise, for example, high pass filters and amplitude limiting by units I3, I4, l5 and I6 respectively, to eliminate one of the difierential pulses, the difierential pulses due to the moving edges of the duration modulated pulses are obtained and are the required phased pulse trains which ma be com-- bined together in amplifier unit I! prior to being used to modulate a transmitter.
  • the initial waveform is a sawtooth th resulting pulses will have one fixed edge the difierential pulses resulting from which are eliminated, and one variable edge, but in the case of, say, a sine wave both edges will vary. However, this makes no difference as by'amplitude limiting the desired dif I fere'ntial pulse train may be obtained.
  • a represents the waveform generated by 30, Figure 1
  • dotted lines 7', k, Z, and m represent the cut-ofi voltages of units l, 2, 3 and 4 respectively so producing after amplification and amplitude limitation pulse 7 trains shown correspondingly at b, d, J, and h,
  • I 1 In a multichannel electrical pulse signalling system, arrangements .for producing in each channel a train of pulses time-phased in accordance with the signal wave to be transmitted by generator to each of said amplifiers with the same phase, means for biasing said amplifiers to begin conducting simultaneously but so that successive amplifiers pass successively larger portions of the generator output wave form from channel to channel, thus producing in the combined outputs of all said amplifiers varying-duration pulses overlapping in time whose leading edges coincide but whose trailing edges var from channel to channel, means for modulating the durations of said pulses in accordance with the modulating said channel, comprising an oscillation generator producing a Wave form output, a plurality of pulse forming circuit arrangements each including anamplifier associated with respective chanwaves of the respective channels, means for differentiating the duration-modulated pulses, and
  • said differentiating circuit comprises a high pass filter fee'dinginto an amplitude limiter device to eliminate one of the pair of pulses of opposite sign resulting from the differentiation operation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Particle Accelerators (AREA)
  • Noise Elimination (AREA)
US618332A 1943-04-07 1945-09-24 Multiplex high-frequency electrical pulse signaling system Expired - Lifetime US2523279A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE472934D BE472934A (it) 1943-04-07
FR962120D FR962120A (it) 1943-04-07
GB18641/44A GB582199A (en) 1943-04-07 1943-04-07 Improvements in or relating to multiplex high frequency electrical pulse signalling systems
GB18640/44A GB582198A (en) 1943-04-07 1943-04-07 Improvements in or relating to multiplex high frequency electrical pulse signalling systems
US526566A US2447233A (en) 1943-04-07 1944-03-15 Pulse time modulation multiplex receiver
US618332A US2523279A (en) 1943-04-07 1945-09-24 Multiplex high-frequency electrical pulse signaling system
US620818A US2454773A (en) 1943-04-07 1945-10-06 Pulse multiplex transmitter employing a cathode-ray tube time modulator

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB558743A GB582177A (en) 1943-04-07 1943-04-07 Multiplex high frequency electrical pulse signalling systems
US526566A US2447233A (en) 1943-04-07 1944-03-15 Pulse time modulation multiplex receiver
US618332A US2523279A (en) 1943-04-07 1945-09-24 Multiplex high-frequency electrical pulse signaling system
US620818A US2454773A (en) 1943-04-07 1945-10-06 Pulse multiplex transmitter employing a cathode-ray tube time modulator

Publications (1)

Publication Number Publication Date
US2523279A true US2523279A (en) 1950-09-26

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US618332A Expired - Lifetime US2523279A (en) 1943-04-07 1945-09-24 Multiplex high-frequency electrical pulse signaling system
US620818A Expired - Lifetime US2454773A (en) 1943-04-07 1945-10-06 Pulse multiplex transmitter employing a cathode-ray tube time modulator

Family Applications After (1)

Application Number Title Priority Date Filing Date
US620818A Expired - Lifetime US2454773A (en) 1943-04-07 1945-10-06 Pulse multiplex transmitter employing a cathode-ray tube time modulator

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US (2) US2523279A (it)
BE (1) BE472934A (it)
FR (1) FR962120A (it)
GB (2) GB582199A (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785227A (en) * 1951-03-10 1957-03-12 Cie Ind Des Telephones Method and device for modulation and demodulation for pulse-type telecommunication system
US2870412A (en) * 1956-02-20 1959-01-20 Collins Radio Co Frequency modulation means including pulse position modulation
US2915746A (en) * 1952-11-11 1959-12-01 Philips Corp Radar relay for transmitting radar images
US4078153A (en) * 1976-09-30 1978-03-07 International Standard Electric Corporation Clock signal and auxiliary signal transmission system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634414A (en) * 1945-08-28 1953-04-07 Gordon W Andrew Proportional control
US2551024A (en) * 1946-12-20 1951-05-01 Gen Electric Co Ltd Multiplex arrangement for generating time-modulated pulses
US3019434A (en) * 1957-10-14 1962-01-30 Goodyear Aircraft Corp Aircraft collision warning system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2256336A (en) * 1939-01-06 1941-09-16 Int Standard Electric Corp Pulse modulation system
US2266401A (en) * 1937-06-18 1941-12-16 Int Standard Electric Corp Signaling system
US2282046A (en) * 1939-09-01 1942-05-05 Rca Corp Multiplex signaling system
US2391776A (en) * 1943-05-29 1945-12-25 Rca Corp Intelligence transmission system
US2403210A (en) * 1942-12-04 1946-07-02 Butement William Alan Stewart Multiplex pulse modulation system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE433923A (it) * 1938-04-23
US2199634A (en) * 1938-06-21 1940-05-07 Rca Corp Secret communication system
US2263369A (en) * 1939-02-03 1941-11-18 Hartford Nat Bank & Trust Co Multiplex telephony system
NL57988C (it) * 1939-02-07
NL135920C (it) * 1939-05-30

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266401A (en) * 1937-06-18 1941-12-16 Int Standard Electric Corp Signaling system
US2256336A (en) * 1939-01-06 1941-09-16 Int Standard Electric Corp Pulse modulation system
US2282046A (en) * 1939-09-01 1942-05-05 Rca Corp Multiplex signaling system
US2403210A (en) * 1942-12-04 1946-07-02 Butement William Alan Stewart Multiplex pulse modulation system
US2391776A (en) * 1943-05-29 1945-12-25 Rca Corp Intelligence transmission system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785227A (en) * 1951-03-10 1957-03-12 Cie Ind Des Telephones Method and device for modulation and demodulation for pulse-type telecommunication system
US2915746A (en) * 1952-11-11 1959-12-01 Philips Corp Radar relay for transmitting radar images
US2870412A (en) * 1956-02-20 1959-01-20 Collins Radio Co Frequency modulation means including pulse position modulation
US4078153A (en) * 1976-09-30 1978-03-07 International Standard Electric Corporation Clock signal and auxiliary signal transmission system

Also Published As

Publication number Publication date
US2454773A (en) 1948-11-30
GB582198A (en) 1946-11-07
FR962120A (it) 1950-06-02
BE472934A (it)
GB582199A (en) 1946-11-07

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